Epson Stylus Photo 720 Service Manual page 59

EPSON Stylus Photo 720 / EPSON Stylus Photo EX3
Table 3-6. Repair of the Control Board
Symptom Condition Cause
IC2 is
broken.
Paper feed
PF motor does not
operation is
revolve.
abnormal.
IC14 is
broken.
IC2 is
broken.
Printing is not
performed or the
Abnormal print data is turned
printing to the set of
unrecognizable
characters.
IC15 is
broken.
Troubleshooting
Check point Solution
Check the PHASE (Pin
16,27) of IC 14, and signal
waveform of OUT (Pin
7,6,9,8).
If PHASE
signal is not
input, replace
IC2.
If OUT is not
Check if waveform of OUT
output from
(Pin 7,6,9,8) is output from
IC14, replace
IC14.
IC14.
Check the signal waveform of
DATA (Pin 29) of IC15 and
Common NPNB/PNPB(Pin
20/16).
If DATA is
not input,
replace IC2.
If no output
signal of
Check the output waveform NPNB/
of NPNB/PNPB, FB of IC15. PNPB, FB
from IC15,
replace IC15.
Unit Repair (Control Board)
Revision A
59